Product Summary

Pipe welding mould relates to a method of producing explosion-welded joints between the pipe and pipe lines. By carefully evaluating and testing the configuration of the ends of the pipes to be joined and also the functioning of the charge system, together with a system for encapsulating the charge and for determining the position of the charge during a welding sequence, it has been possible to provide a practical and reproducible system which escapes the drawbacks of partial and poor weld bonds, cold-work hardening of the pipe material, and surface damage encountered with known systems of this kind. The method has been applied and tested on ferrite stainless material, so-called Duplex material, and on all carbon steel grades used in the production of pipe lines.

Pipe welding mould uses two welding heads comprises the steps of moving each of the welding heads upwards around the pipeline along the respective section of the girth joint, feeding a welding wire to each of the welding heads so that the welding wire is fed substantially tangentially with respect to the surface of the pipe, and forming a circumferential weld by molding it to hold the molten metal of the welding bath in the welding zone. An apparatus for carrying out the method for welding girth joints in pipelines comprises an annular track structure having at least two carriages mounted thereon which are connected with drives adapted to impart a translator motion to the carriages.